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Another mysterious aircraft has arrived in the country, as a top-secret spy conference begins.

Fairfax reported last night that a Gulfstream jet with blocked credentials landed at Wellington Airport during the evening.

A screen grab of online aircraft tracker FlightRadar24 showed the flight's arrival, but it was not known why it was in the capital.

The plane's arrival follows a cryptic week of aircraft arrivals in the country, as a Five Eyes spying network conference takes place at luxury Millbrook Resort, near the Central Otago town of Arrowtown.

Police and security personnel were scattered across the grounds of Millbrook Resort during the weekend, keeping a close eye on the comings and goings. Locals reported seeing snipers and bodyguards in Arrowtown last week.

Prime Minister Bill English said he would meet those involved in the conference and reaffirm the Five Eyes relationship, and its importance to the security of New Zealanders and people around the world.

Asked if there was any suggestion New Zealand was not pulling its weight inside the alliance, English said there may have been issues in the past, but no longer.